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Math Help - line passing through

  1. #1
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    line passing through

    Line passing through (-4,7) and (1,-3)
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  2. #2
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    Use the 2 point formula:

     \frac {y-y_{1}}{x-x_{1}} = \frac {y_{2}-y_{1}}{x_{2}-x_{1}}
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  3. #3
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    does it matter where i put the numbers
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  4. #4
    Junior Member Cthul's Avatar
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    Quote Originally Posted by alysha230893 View Post
    does it matter where i put the numbers
    No, it does not as long as it follows the rule.
    Say you subbed y_2 with 7
    y_2
    Then the numerator must be x_2 from the same point you subbed y_2 first, in this case, it has to be -4.

    Regardless which way you put which points in first, you will always get the same answer.

    \frac{7--3}{-4-1}=-2

    ---

    \frac{-3-7}{1--4}=-2

    To refrain from getting confused, label the points.
    (-4,7) and (1,-3)
    (x_1,y_1) and (x_2,y_2)

    or

    (-4,7) and (1,-3)
    (x_2,y_2) and (x_1,y_1)
    Last edited by Cthul; May 30th 2010 at 02:57 AM.
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